The Bosch Delta canisters
Hey Edgar,
congratulations to this rare specimen. They were called the "Delta cleaners", some design prototype going into production more or less right away (or at least after some quick spiffing up of details). They are rare, we had them around for just a few years. (Looking "too" modern in the 70s, they did not sell too well).
The basic idea was to have anything "air stream" (filter, motor, exhaust etc.) in one straight line and everything "electric" on top of that (switch, filter light, cable connectors).
Another "new" thing (back then) was to have it bumper protected at all critical spots, not just having a small vinyl stripe around the body as had other brands.
Hence the black vinyl foam "tub" all around, the plastic body in the middle was either midnight blue, salmon coloured, corn yellow or cactus green like yours.
Model variations would comprise with or without cable winder, w. or w/o. electronic speed control, w. or w/o. bag indicator light.
Btw. the combo floor nozzle that you have there was added later (white body and black front bumper). The original Delta nozzles were all black and not so large in their surface. (Or this one would sell only with the top model of the four).
That is all I know from memory, it's been a while since ;-)
Joe
